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Evaluation of updated nitric acid chemistry on ozone precursors and radiative effects

机译：臭氧前体上更新的硝酸化学评价及辐射效应

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This study shows that revising the reaction rate of NO2 + HO center dot -> HNO3 improves simulated nitrogen partitioning and changes the simulated radiative effects of several short-lived climate forcers (SLCF). Both laboratory and field study analyses have found that the reaction rate should be reduced by 13-30% from current recommendations. We evaluate the GEOS-Chem model over North America with and without the recommended update using observations from the Intercontinental Chemical Transport Experiment - North America (INTEX-NA) Phase A campaign. Revising the NO2 + HO center dot -> HNO3 rate coefficient improves model performance of oxidized nitrogen partitioning by increasing NOx concentrations in the upper troposphere and decreasing HNO3 throughout the troposphere. The increase in NOx concentrations has a corresponding global increase in O-3 concentrations and local increases in sulfate aerosols, causing a perturbation in simulated radiative effects. These findings demonstrate the positive influence the mechanism update has on the partitioning of oxidized nitrogen species, the benefits it provides when compared to aircraft observations, and the simulated radiative effects that the reduction induces.
机译：该研究表明，修改NO2 + HO中心点的反应速率 - > HNO3改善了模拟氮气分配，并改变了几种短寿命的气候施用者（SLCF）的模拟辐射效应。实验室和现场研究分析都发现反应速率应从当前建议中减少13-30％。我们使用来自洲际化学传输实验的观察 - 北美（Intex-Na）阶段的观察来评估北美的Geos-Chem模型，而无需推荐的更新。修改NO2 + HO中心点 - > HNO3速率系数通过增加上层对流层中的NOx浓度并在整个对流层中降低HNO3来提高氧化氮分配的模型性能。 NOx浓度的增加具有相应的O-3浓度的全局增加，硫酸盐气溶胶局部增加，导致模拟辐射效果的扰动。这些发现证明了机制更新对氧化氮物质分配的积极影响，与飞机观察相比，它提供的益处以及减少诱导的模拟辐射效应。

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